Gas-insulated metal-enclosed switches (GIS) and gas-insulated metal-enclosed transmission lines (GIL) are one of the most important devices in the power system. They have the dual tasks of control and protection. If they failed during operation and the problem cannot be solved timely,it will cause serious damage to the grid. Partial discharge fault is a common fault type of GIL/GIS. It is necessary to use GIS partial discharge online monitoring and fault location system to perform real-time online monitoring of GIL/GIS partial discharge signals and analyze and process the measured data and real time give comprehensive judgment of insulation status. Then repair schedule can be arranged according to the monitoring results to avoid major grid accidents caused by equipment failure and to ensure the normal operation of the system with minimum maintenance cost.

There are many reasons for the deterioration of the dielectric medium, such as ionization corrosion caused by a strong electric field for a long time, insulation wear caused by mechanical high-frequency vibration, aging decomposition of the medium caused by thermal effects, and moisture insulation. The dielectric medium is degraded, and the performance is degraded so that the dielectric breakdown has a development process, which makes the on-line monitoring of insulation practical and effective. The system uses Smart Quick software developed totally by HVHIPOT. It uses advanced high-speed DSP digital processing technology and software. The processing technology makes our monitoring system fast and accurate, which is the most economical and reliable solution for the online monitoring system of GIS.